Advanced Materials Research Vols. 225-226

Abstract: This paper took a 3-TPT Parallel Robot as the object to study its singularity within the workspace. Firstly the kinematics equation of Parallel Robot was established according to the kinematics analysis and the Jacobian matrix of parallel mechanism could be obtained at the same time. Then the workspace of Parallel Robot was carried on the solution and the analysis. Finally the degree of operability was taken as the measure index to analyze the singularity of Parallel Robot within the workspace, and the results showed that this Parallel Robot does not have singular position. The analysis results of this paper have laid the theoretical foundation for the position control and processing track planning of this Parallel Robot.

Abstract: This paper studied some kinds of realization modes of speed chain compute, load distribution and operation aimed at the realization of paper machine driving system. The frequency conversion control system based on PLC cooperating with digital manipulator was brought forward. It was mainly made up of three parts: PLC, frequency converter and digital manipulator. It used PLC to realize digital speed chain and load distribution. And it exchanged data and parameters by communication through field bus network. The results indicate that the problems of speed chain compute, load distribution and operation were solved effectively by data gathering and computing with PLC, so it is a driving system of high performance.

Abstract: Coexistence of different wireless communiation system is a worldwide phenomenon at present. Thus how to mitigate the spurious emission interference has become an emergent point to improve the performance of communication. This paper analyzes the spurious emission interference in TD-SCDMA on POI. According to the theories of spurious emission interference and isolation, this paper constructs a platform to simulate such coexistence. Considering the characters of each system, the platform applies Monte-Carlo method to obtain desired parameters, including stray electrical level and MCL. These parameters are significant guide lines for equipments to mitigate interference.

Abstract: Online consumers experience a three-stage transaction process and every stage has its different characteristics, we developed a model based on S-O-R (Stimulation-Organism-Response) framework to show how they influence online consumers’ repurchase behavior. We used data collected from undergraduates by specified online purchase and the method of Structure Equation Modeling (SEM) to test the model. The empirical findings indicated that three aspects of website characteristics including website design, functionality and usability, post-purchase service quality all significantly affected online repurchase behavior both directly and indirectly through consumer satisfaction.

Abstract: Feature spaces optimization plays a very important role in object recognition and categorization. After analyzing of several fashionable local features at present, some optimization algorithms based on the information theory are proposed. In this paper, we describe the approaches to recognize generic objects using these features which have been optimized. As baselines for comparison, we also implemented some additional recognition systems using other optimization algorithms. The performance analysis on the obtained experimental results demonstrates that the proposed optimization algorithms are effective and efficient.

Abstract: Learning itself is substantially ubiquitous, while real ubiquitous learning needs can only be supported by appropriate learning technologies. Technology enhanced personalized learning service is indispensable for ubiquitous learning. This paper discusses several key issues for personalized learning service provision in ubiquitous learning environments, including learner modeling, context management, ontology adoption and service visualization.

Abstract: E-commerce have become increasingly popular in our everyday business and personal lives. For many organizations, competitiveness in e-commerce requires a successful presence on the web. This paper provided an insight about factors affecting business-to-business e-commerce adoption and implementation in small and medium-sized enterprises. The research is based on a wide literature review, focused on proposing a theoretical model of technological, environmental and organizational factors influencing e-commerce adoption and implementation. The results of the empirical research provided indication to small and medium-sized enterprises interested to adopt business-to-business e-commerce, large companies interested to conduct e-commerce transactions with small and medium sized companies and policy makers.

Abstract: A crater blasting model of rock with pre-existing defects under blasting loads is established by using finite difference method. The defects are saturated with water and are randomly distributed. The defects include voids, pores and small open joints. A shock equation of state (EOS), obtained from the existing test results, is employed for the granite near the explosive charge, and for the granite far from the charge, a linear EOS is applied. A modified principal stress failure criterion is applied to determining the granite statuses. The granite dynamic strengths, which increase with strain rate, are calculated from the existing test results. The simulation results show that under blasting, the strength of wet rock is lower than that of dry rock.

Abstract: The existence of water affects the mechanical properties of cracked rock mass. Taking into account the friction generated by the crack closure, the stress intensity factor of the center cracked plate subjected to compression and seepage pressure was obtained through the theoretical analysis and numerical calculation of the boundary collocation method. The results show that crack tip stress intensity factor increases with the increasing of the seepage pressure, but decreases with the increasing of crack surface friction and the confining pressure. Finally a failure criterion for cracked rock mass under seepage pressure and confining pressure is developed.

Abstract: P2P technology has become one of the most effective approaches to internet video broadcast for its simple deployment, good scalability and high cost-effectiveness ratio. This article proposed technology based P2P-based online video teaching system,P2P technology will be compared with traditional technologies, described the demand characteristics of online video, online video systems network architecture and design method, discussed the media data distribution algorithm from the node management, buffer management, data-driven,Video source coding.Finally get research conclusions.